要在Aspnetboilerplate中实现实体的加密和解密，可以按照以下步骤操作：

1. 创建一个加密服务类，用于加密和解密实体。可以使用.NET的加密类库，如System.Security.Cryptography。

using System;
using System.IO;
using System.Security.Cryptography;
using Abp.Domain.Services;

namespace YourNamespace
{
    public class EncryptionService : DomainService, IEncryptionService
    {
        private const string EncryptionKey = "your-encryption-key";

        public string Encrypt(string plainText)
        {
            byte[] clearBytes = System.Text.Encoding.Unicode.GetBytes(plainText);
            using (Aes encryptor = Aes.Create())
            {
                Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] {
                    0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76
                });
                encryptor.Key = pdb.GetBytes(32);
                encryptor.IV = pdb.GetBytes(16);
                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(clearBytes, 0, clearBytes.Length);
                        cs.Close();
                    }
                    plainText = Convert.ToBase64String(ms.ToArray());
                }
            }
            return plainText;
        }

        public string Decrypt(string cipherText)
        {
            cipherText = cipherText.Replace(" ", "+");
            byte[] cipherBytes = Convert.FromBase64String(cipherText);
            using (Aes encryptor = Aes.Create())
            {
                Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] {
                    0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76
                });
                encryptor.Key = pdb.GetBytes(32);
                encryptor.IV = pdb.GetBytes(16);
                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(cipherBytes, 0, cipherBytes.Length);
                        cs.Close();
                    }
                    cipherText = System.Text.Encoding.Unicode.GetString(ms.ToArray());
                }
            }
            return cipherText;
        }
    }
}

2. 创建一个接口，用于定义加密和解密的方法。

using Abp.Domain.Services;

namespace YourNamespace
{
    public interface IEncryptionService : IDomainService
    {
        string Encrypt(string plainText);
        string Decrypt(string cipherText);
    }
}

3. 注册加密服务类到Aspnetboilerplate的依赖注入容器中。在YourProjectName.Core项目中的YourProjectNameCoreModule.cs文件中，添加以下代码：

using YourNamespace;

namespace YourProjectName
{
    [DependsOn(typeof(YourProjectNameCoreModule))]
    public class YourProjectNameCoreModule : AbpModule
    {
        public override void PreInitialize()
        {
            // 注册加密服务类
            IocManager.Register(DependencyLifeStyle.Transient);
        }

        // ...
    }
}

现在，你可以在需要加密和解密实体的地方注入IEncryptionService接口，并使用Encrypt和Decrypt方法对实体进行加密和解密。例如：

using Abp.Domain.Services;

namespace YourNamespace
{
    public class YourEntityManager : DomainService
    {
        private readonly IEncryptionService _encryptionService;

        public YourEntityManager(IEncryptionService encryptionService)
        {
            _encryptionService = encryptionService;
        }

        public void SaveYourEntity(YourEntity entity)
        {
            // 加密实体的敏感数据
            entity.SensitiveData = _encryptionService.Encrypt(entity.SensitiveData);

            // 保存实体到数据库
            // ...
        }

        public YourEntity GetYourEntity(int id)
        {
            // 获取实体从数据库