using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace GB5Shared.EncryptionHelper { public interface IEncryptionService { /// /// Encrypts a given plaintext string using the specified key. /// /// The plain text to encrypt. /// The encryption key. /// Base64-encoded encrypted text. string Encrypt(string plaintext, string key); string Decrypt(string encryptedText, string key); } }