public TrithemiusCipher(string charset = Charsets.English)
 {
     this.Charset = charset;
     _vigenère    = new VigenèreCipher(this.Charset);
 }
 public VariantBeaufortCipher(string charset = Charsets.English)
 {
     this.Charset = charset;
     _vigenère    = new VigenèreCipher(this.Charset);
 }
 public GronsfeldCipher(string charset = Charsets.English)
 {
     this.Charset = charset;
     _vigenère    = new VigenèreCipher(this.Charset);
 }